Unit installation

Chapter 1 Introduction Installation and Operation Manual
1-8 Physical Description FCD-E1
traffic addressed to other RAD equipment that operates over E1 links, such as the
Megaplex modular TDM E1/T1 multiplexers, DXC multiservice access nodes, etc.
Alarms
FCD-E1 stores alarms detected during its operation in a buffer that can hold up to
100 alarms. During regular operation, an alarm indicator on the front panel lights
when alarms are present in the alarm buffer, to notify the local operator that alarm
conditions have been detected. The local operator can then review the contents of
the alarm buffer using the supervision terminal, a Telnet host, or a management
station.
In addition to the alarm buffer, the front-panel LED indicators display in real time
the status of the main link and sublink, and alert when test loops are present in the
system. Also, the FCD-E1 version with two RS-232 interfaces can automatically
report alarms to a remote terminal using a dial-up modem.
FCD-E1 can provide an alarm indication by means of an alarm relay (dry contacts),
which enables remote signaling of alarm conditions when FCD-E1 is located far from
the personnel in charge for its proper operation.
The alarm relay has a pair of change-over dry contacts: the normally-open (NO)
contacts close in case of alarm, and the normally-closed (NC) contacts open in
case of alarm. The alarm contacts are floating with respect to the signal and chassis
grounds of the FCD-E1.
Statistics Collection
When CRC-4 is used, FCD-E1 collects and stores E1 port statistics in compliance
with ITU-T Rec. G.706. These statistics can be retrieved by the management
functions, e.g., through the supervisory port, and via inband management.
Diagnostics
FCD-E1 has comprehensive diagnostics capabilities that include user-activated
local and remote loopbacks on the data ports, on the sublink and main link.
Transmitting an inband code can activate the remote data port loopbacks. To
enable testing of marginal links, FCD-E1 also offers bit error rate (BER) testing on
the synchronous data channels, using a locally generated pseudorandom
sequence. To provide compatibility with other BER testing equipment, the user
can select the pseudorandom pattern.
Maintenance is further enhanced by an automatically performed power-up
self-test, which provides circuit-level diagnostics data.
1.2 Physical Description
A 3D view of FCD-E1 is shown in Figure 1-2.
The front panel includes push buttons, LEDs, an LCD display and the supervision
terminal connector for controlling and monitoring the FCD-E1 operation. For
details, see Chapter 3.